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This 4 1/2 inch long RPM indicator has a 1905 patent date and was made by Henry Disston & Sons. This one hasn't seen much use with very complete plating, smooth operation, and a nice crisp point. If you want one for use this would be hard to beat quality wise.
For information on old tools the resources at Mid West Tool Collectors Association are top notch. They have links collected there for everything antique tool related.Make sure to check out my other items, I will combine shipping just wait for the invoice. I am in a selling mood, it's not Christmas yet but schit has to go, offers is set to let me see offers that I don't think I'll take, might change my mind..........