A 6105 is great but certainly not "cheap", you might spend between 500 and 1000 USD.
Better off keeping an eye out on offerings here, and another option is to find cheap 1980s Seiko models like 4205 or 4206.
If the latter, just make sure you're getting the right size for you and if you buy from Asia be careful as movements there may have been highly corroded by humidity, and call for expensive repairs. You need to find one that works and keeps time.

 

Yeah a Seiko 6119 5 Sports is the next one I am going after

 

20 hours have come and gone. What was the time sensitivity about?

 

Waterproof your vintage watch? Easy Peazy!

https://omegaforums.net/threads/39548/#post-459868

 

Well since this I have decided on a Seiko chrono from the mid 70s

 

Happy to hear it and post some photos

 

Yeah after over 20 lost auctions i'm done with divers for awhile I love Seiko chronos and the are going up quick I will post pictures as soon as it gets here! It is a bit of a project

 

Seiko chrono prices are going through the roof. A very nice 6138-8020 Panda Dial just sold for $1225 yesterday, exceeding most recent sales by a large margin.

 

After 13 lost auctions I went went back to a diver and got this a Seiko 8123 6109 from December 1983

 

That's a very good choice, virtually indestructible. I wear a 7548 while rowing; waterproof and shockproof and, easily replaceable if it goes overboard.

 

Nice choice. I think you will be happy with Seiko at that price point

 

Got it for 78$! Next is a Hamilton thin o matic

 

Don't go too cheap on the hammie, the service may cost you more than the watch

 

Yeah seller said it accurate, but fingers crossed! First thing will be checking the gaskets.