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Please ID as close as possible
Stamped tags? If so probably not made from a conventional font.
Good matches for appearance are two fonts based on engraving systems. Lineto's Gravur Condensed http://lineto.com/The+Fonts/Font+Categories/Text+Fonts/Gravur+Condensed/ and Optimo's Gravostyle Basic http://optimo.ch/typefaces_Gravostyle-Basic_all_CharacterMap.html Only major difference that I spotted is the open top 4 and the tails on 6 & 9. There are other engraving/machine plotting fonts, but they are generally wider than the letters on the tags, particularly for O, C etc. which usually are rounded without the parallel stroke section on the sides.
This is perfect!