I have some new old stock of road derailleurs of all sorts - mostly Shimano - you are welcome to come and have a look if you are anywhere nearby - or I can have a look and send a list of what have got? What kit is on there?
You'd need to share with us the diameter of the seat tube (eg 28.0mm) and the make of the intended RD (if you have an aspiration to match it). Most FDs of that era would be designed for a 52t large ring and all the ones I've come across would allow a drop to a 39t. I have one or two in my box too.
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