Pace Elastomers.

Sounds like a question for Justbackdated!

However, using the SWAG* method I reckon it's somewhere between 40 and 60 as they were available in soft, medium and hard (depending on the rider's fondness for pies).

Let us know how you get on - I love geeky stuff like this.

*Scientific Wild-Assed Guess
 
Thanks, but I 've got some old ones already.
I wouldn't' know how to measure the Shore A of one anyway.
I'm just trying to find out what rating of rubber to order.
 

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