Marksman Model 70

If it's one of the re-branded Weirauchs there might be an equivalent HW gun that uses the same parts. I'm sure some of the more knowledgeable folks should be able to help. A pic would help with the ID, maybe one with the stock removed as well. You might also try asking in the Traditional Airguns forum-most of the springer guys read posts there often.
 
You might find this link helps you with your search, there is a good picture of the cocking shoe at the bottom, good luck!

 
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Maybe Rick at Precision Pellet?

Also checked JG Airguns but all they show is the schematics for it:

Baker Airguns might be a longshot, but least he can say is no, they don't have any parts for them: