Yes, you are exactly correct; the crosshatching on yours is for the gold to stick to; this type of overlay work is called koftgari. The marks on the threadstarter are rasp teeth. You may find a differing pattern on the other side (some rasps are the same on both sides, some are not). This seems to be fairly common and traditional in the Arab sphere, on Luzon, and in N America, at least.
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