I'll say 1954, probably has a small circle on the front of the lever with 5F stamped inside of it?

It's most likely a model EG because 90% of them that year were but you might have an R, I've got some R's written down here really close to that serial number but can't say for sure if they made the models in runs or just whatever they had in the stock bins.

Does the forearm have a schnoble tip on it?