Year of manufacture ?

So, I’ve acquired a Santa Barbara Mauser in 7x57 ( cheers Phil 😃 )
The serial # is R47387
Any idea where I’d find something to date it ?
Google has lead me up several blind alleys, so far.
I understand that they supplied actions to Parker Hale and BSA back in the 60’s.
Any leads ?

The SB actions were also imported into the US in large numbers by several importers. . .

Late '60's, '70's and 80's they were used by Parker Hale and other small scale makers, not BSA though as they made their own actions.