Brass Porthole
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 SAILORS BRASS SHIP PORTHOLE NAUTICAL WALL CLOCK $175  US $89.99
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 Bronzed Porthole Mirror 20 Antique Porthole Gift US $129.99
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 Ship Wheel Clock 18quot Antique Porthole Gift NEW US $39.99
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 Nautical Dark Wood Plaque Bright Brass Diving Helmet Clock Thermometer New US $19.95
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 Porthole Ship Wheel Mirror 24 Lacquered Brass Nautical Gift NEW US $179.00
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 Porthole Shipwheel Quartz Clock 18 Lacquered Brass NEW US $249.00
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 Authentic Models Nickel Porthole Eye of Time Clock 35 US $44.99
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 Nautical Clock Porthole Brass NEW FREE SHIPPING US $89.95
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 AUG SCHATZ SÖHNE 8 DAYS NAUTICAL MARITIME PORTHOLE SHIPS BELL CLOCK Germany US $375.00
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 Brass Porthole Clock 10 Antique Porthole Nautical US $99.99
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 Nautical Dark Wood Plaque Antique Brass Diving Helmet Clock Picture Frame New US $19.95
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 1970s Emory Douglas Co Ships Clock Brass Case Quartz Movement US $125.00
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 Ship Wheel Clock 12 Porthole Clock Nautical NEW US $24.99
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 18 Wood Brass Ships Wheel Clock Wooden Captain US $49.99
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 Brass Porthole Clock 10 Porthole Tropical Decor NEW US $99.99
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 PORTHOLE BRASS BAROMETER US $75.00
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 Solid Brass Porthole Clock 10 Nautical Wall Decor US $99.99
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 20 Solid Wood Shipwheel Porthole Brass Clock Nautical US $64.73
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 BEAUTIFUL 8 DAYS SHIP BRASS BULKHEAD CLOCK w MECHANICAL WINDING MOVEMENT HEAVY US $169.99
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 Ships wheel vintteak w brass center porthole clockBRASSOM USA great cond US $100.00
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 Brass Porthole Clock 7 Antique Porthole Gift NEW US $59.99
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 Ship Wheel Clock 18 Antique Porthole Nautical US $39.99
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 GORGEOUS 9 SOLID BRASS NAUTICAL PORTHOLE QUARTZ CLOCK US $119.99
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 Ship Wheel Clock 12 Porthole Mirror Nautical NEW US $24.99
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 8 Nautical Brass Porthole Ship Clock New Best Deal S US $36.00
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 Porthole Mirror Aluminum Green Porthole Mirror Gift US $49.99
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 Solid Brass Porthole Clock 7 Nautical Wall Decoration US $59.99
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 JUST A HANDTOOLED HANDCRAFTED VINTAGE PORTHOLE CLOCK US $35.00
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 7 Porthole Ship Wheel Clock Nautical Boat Clocks New US $41.00
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 Nautical Dark Wood Plaque Polished Brass Diving Helmet Clock Thermometer New US $19.95
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 Porthole Desk Set Weems Plath Elegant Clock Barometer GIFT NEW US $129.95
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 Round Nautical Decor Porthole Ship Clock New Best Deal New US $35.00
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 Porthole Eye of Time Nickel Clock Nautical Timepiece Watch Magnifying Glass NEW US $44.95
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 Gloss Black Finish Porthole Mirror 20 Brass Porthole US $129.99
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 AMAZING 9” Diameter PORTHOLE NAUTICAL DÉCOR US $161.00
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 Bronzed Porthole Mirror 20 Porthole Clock Gift NEW US $129.99
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 AMAZING 24” Diameter PORTHOLE SHIP WHEEL CLOCK NAUTICAL SHIP WHEEL DECOR US $218.00
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 Brass Ship Porthole Clock Brassom Ships Clock USA US $99.99
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 TRADITIONAL BRASS PORTHOLE CLOCK ON ROSEWOOD BASE CLASSIC NAUTICALIA US $69.99
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 AMAZING 24” Dia PORTHOLE SHIP WHEEL CLOCK W LACQUER US $279.00
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 ROYAL NAVY SOLID BRASS SHIPS BILKHEAD CLOCK LARGE 7 LIMITED EDITION CLASSIC US $125.00
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 Ships Time Porthole Brass and Oak Wall Clock with Ships Chimes COOL US $50.00
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 Brass Porthole 11in Quartz Quite Sweep Second Clock US $34.99
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when you think of a typical ships porthole, does it have 6...or 8 rivet blobs, in the brass surround?
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=160246144293&ssPageName=STRK:MEWA:IT&ih=006
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=270241099583&ssPageName=STRK:MEWA:IT&ih=017
The rivet blobs you ask about in you question, shown in the links, are the bolt / rivet pattern the the porthole would be mounted to the vessel with. The more bolts / rivets that hold the porthole the more pressure it should with stand.
The more of a chance that the porthole would be hit by a strong wave the more bolts or rivets you would want to have to make it with stand the force of the wave.
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