Need help identifying RM model fridge

[happygrrly]

Hi all,

I finally took possession of my 1971 Overlander Intl 27ft this past weekend, after a year of waiting. It was a gift, so I'm not complainin' ;-)

The fridge is not working, and so far I've only been able to determine that it is a Dometic RM model, 2-door, frost-free, made in Sweden.

The plate at the bottom which shows the model/product numbers is very hard to read from dirt and wear. Can anyone advise how I can determine the exact model number, eg, is it derived from the product number?

Thanks!
Barb