I bought an old vernier caliper with a BG or BL mark. Can anyone help me identify the brand?

It’s BL, Beiliang’s caliper from Beijing Measuring Tools and Cutting Tools Factory. You can search “Beijing Measuring Tools and Cutting Tools Factory” online to find out. Beiliang’s calipers are indeed an old brand in China, but the quality It's pretty good. There are fewer calipers of this brand now. You guys are so generous, 50 cents, thanks in advance, I hope it satisfies you.

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