For non-homages the closest I can think of is the Seiko Turtle and Spinnaker:

 

Eza Sealander

https://ezawatches.com/shop/sealander-black/

Nodus Retrospect

https://www.noduswatches.com/retrospect

Meraud Bonaire

https://meraud-watches.com/

 

Have a look at Serica - bit more field-watchy but those hands! (can't attach pcis yet )

https://www.serica-watches.com/en/watch/

 

also check out mercer watches

https://www.mercergoods.com/products/voyager-ii-ebony

 

Probably just me but the Chris Ward C60 always puts me in mind of a Seamaster.

 

NTH Odin, maybe?

Tapatalk is all natural. Wash in cold water and tumble dry on low heat. Some talk shrinking may occur.

 

I feel like the Skipjack is a better option

 

At almost 1/10th of your budget it's hard to go wrong with the Corgeut 2013a. At this price there's a few downsides like the Miyota 82 series movement and a bezel that has a bit of backplay. They do seem to be well reviewed for those who have them.

https://www.aliexpress.com/item/32864633683.html

 

I do not know if I'm here at the right place, but I'm looking for an affordable alternative to following Omega Seamaster 300.

Perhaps Tiger Concept?

http://www.tiger-concept.com/5508O-watch.html

 

You could do an SKX mod...

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There is a guy @ eBay that sells watch parts or assembled pieces. Check him out. The link shows a watch with a Miyota movement.
https://www.ebay.com/itm/41mm-Steri...matic-Mechanical-mens-Watch/183368581094?hash=item2ab19e7fe6:g:WIIAAOSwUrlba6Ce

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Watch Recon or someone in the Nth thread may be willing to part with their homage. Mine is not going anywhere... good luck!

View attachment commander.jpg

 

 

If non homage of that watch is ok some more options that meet the requisites:

Certina DS Action Diver Powermatic (sapphire).
Orient Triton (sapphire).
Sea-Gull Ocean Star (sapphire).
Sea-Gull Ocean Star Inter (sapphire).
Tissot Seastar 1000 (sapphire).

 

Raven is a great alternative

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Twisted lugs Orthos

 

Sterile Version

https://www.aliexpress.com/item/32981807299.html?spm=a2g0o.detail.1000060.2.3c1e1ad5hT5d9D&gps-id=pcDetailBottomMoreThisSeller&scm=1007.14977.145068.0&scm_id=1007.14977.145068.0&scm-url=1007.14977.145068.0&pvid=d02d87b6-d26f-4aa1-9518-9b482898d0f4&_t=gps-idcDetailBottomMoreThisSeller,scm-url:1007.14977.145068.0,pvid:d02d87b6-d26f-4aa1-9518-9b482898d0f4

 

Hi. AWC Panama makes these SKX mods (some upgraded with NH35 movement)