Help with North Borneo countermarked coin. [gelöst]

Please help to rectify what means of countermarked it coins. Looks like old. Condition old. Price not expansive, especially damaged or stamped for some own purpose. Any info will be help. Thanks.

Hello — It's a good idea to provide a link to the coin in the catalogue. 

If my link is the right coin, then yours is almost 3g too heavy. This is because it's is not a countermark but some sort of blob on the surface. It seems to be the same colour as the coin, but I doubt it's actually bronze because there's an impression of another coin into it. It looks like the coin spent some time in the ground since it's very corroded. The blob may be some sort of gum or resin that darkened in the ground.

Ideally it should be removed. A safe way to do that is acetone, wich will not remove the patina elsewhere on the coin. We don't know what the condition of the surface is under the blob. Probably nicer because not exposed to corrosive matter (soil + rain water), but also likely to have less patina than the rest.

Hi Camerinvs! Thanks for reply. Blob on coins it same material as coins made, it not possible to remove, because blob same as welding. I agree that coin stored long time under ground, but purpose of blob and countermark on blob still unknown. Thanks and best regards, Ruslan. 

I guess they made the coin into a button and later parts of it were then removed again

Dear Apuking. I not agree about it version, because on blob stamp and vissible letter that I cant recognize. I guess that it some plantion token, that used not in North Borneo or people making some test in blacksmith shop. 

Two points:

1. The blob is PMD (post mint damage). The blob was not on the surface of the planchet when it was struck. This is undeniable.
2. On the blob there is NO countermark. At best it's a vise job made by applying another coin which was then “squeezed” in some way onto the surface with a vise (or, less likely, with a hammer, but in this case the reverse would have been somewhat flattened during the hammering). It looks like the letters could be read with a magnifier, and if so I suspect they're backwards.

I have a thread on countermarks but unfortunately many of the links were broken when the site was updated some years ago. I have started to fix only a few of them so far, but the basic facts about countermarks are still accessible anyway.

In conclusion: the blob and what's on the surface of it are PMD.

EDIT — Since you say the letters are visible, why don't you tell us what they are? That would be useful.

EDIT 2 — On this other coin you have posted there is, indeed, a countermark. I have not looked into it yet. I hoped a specialist of Mexican coinage in that period would have.

Thank you very much!