Weight of cast Chinese cash

I found a cast Chinese cash coin in a bulk lot of 100 coins, and identified it as a Jiaqing (Boo-chiowan) 1 cash:
https://en.numista.com/catalogue/pieces13110.html

I am fairly new to collecting world coins and my previous oldest coin is only from 1897, so I was excited at the idea of finding a 200 year old coin. I was a bit skeptical of its authenticity, but maybe that's just because I didn't expect to find such an old coin in a regular bulk lot. It seems to be a very low value coin even given its age, so I'm not sure there's a real motivation to counterfeit it, but maybe as a tourist replica?

Visually, it looks a lot like the pictures on the page, except darker and much more worn. However, the weight does not match the 4.6 grams given on that page. Mine only registers 3.5 g, IIRC. I understand these were cast rather than milled and therefore aren't as uniform, but is it possible for that (and wear) to account for being a full gram off? Or do I likely have a fake / modern replica?

I can provide photos later, if it helps. I'll doublecheck the weight when I get home as well. Thanks!

As this coin one of the must common existing, there is no reason to counterfeit it. However pics are always good to confirm any authenticity.

As you said the coin is worn. And cast minting can introduce such variations, particularly some varieties who are told to have variable sizes.

Here are a couple of poor cell phone pictures. The obverse is with flash, the reverse is without. I couldn't get the characters to be legible without the flash, though it distorts the color.



Weight is 3.4 g, diameter is 22.6 mm, thickness is 1.2 mm.