The Robust was the blue collar bread and butter double from La Manu. Most of them were 65mm til after the second war, if memory serves. There are others on the board that can speak better to them than I, but that price seems a little high, but not much. If in the condition you describe, will probably out live you. My book only lists serial numbers and dates for pre war Ideals.

New sling parts and mechanisms are still available.

Mike

Tolerance: the abolition of absolutes

Consistency is the currency of credibility