I'm not aware that the actual Rodda records exist (please let us know if you find out who if anyone has got them). However, Rodda had guns made for them by various makers & it's sometimes possible to get a date at least from the original makers serial number.

For example: I have a Rodda but it was built by W&C Scott (there's no Scott name on the gun but from the action/style etc it could have been made by no other). The gun carries the Scott serial number which was also adopted by Rodda. From this I've been able to find the year it was built from the available list of Scott serial numbers. Sadly the actual records for W&C Scott and Webley & Scott rifles were destroyed (most of the shotgun records still exist).

Regards
Webley