Turtle vs Turtle: Looking at the 6309 and the SRP77x’s
WORN & WOUND by Ilya Ryvin - 02.11.2016

snippage...
The 6309-7040 is undoubtedly one of Seiko’s most iconic divers. Manufactured by the brand from 1976 to 1988, the 6309 was the bedrock of Seiko’s recreational diver collection for approximately 12 years. Amongst Seiko fanatics, it remains one of the firm’s most popular pieces. So when Seiko first announced the SRP77x, the brand’s reissue of the 6309-7040, we knew it had the potential to be a huge hit. In our view, its success would ultimately hinge on Seiko producing a faithful reinterpretation of the beloved diver, keeping the general feel and look of the 6309 while retaining the solid bang-for-your-buck build quality that Seiko is known for.

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http://wornandwound.com/2016/02/11/turtle-vs-turtle-looking-at-the-6309-and-the-srp77xs/

Good read Sam. To me, there is enough difference that they are not quet the same. I think I still like my old 6309 over the newer one. I also would say that I for one have never had any problem working the crown and infact think itis one of the best placements on any watch ever made.