|I would suggest that after the passage of so much time, the original stain colour will have altered considerably. If I were you, I'd get something that looks close, along with some small tins of colours that will modify your starting colour (maybe a small tin of a red hue plus ebony, to neutrally darken). Mix (recording what you add and in what quantity) until you have something that looks reasonable, then apply some to a test piece of the wood you're using. Let it dry, evaluate and adjust until you're satisfied.
C&C 27 Mk IV