Hi lgmx, your watch does appear to be a Buren Watch Hamilton grade 971, caliber 02-FR. These were made in Switzerland after production ceased in USA. You'll have to do some searching for a mainspring. Maybe start on eBay, try asking sellers there and other pocket watch parts sellers.
Thank you for your quick reply, then my target is a mainspring for a caliber 02-FR!
Cheers.
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