Russia 1913 Rouble XRF Silver Content Too High? Fake Or Real?

It could be one of the Chinese made imitations.
A number of replicas or imitations of many coins are made with good silver.
Would not surprise me if they may not be exactly .900
As a guess they may be a bit high or a bit low.
Not saying foul- but $20 worth of silver could be used to make such a coin to fool collectors.
The maker would have a good profit if someone bought one for a hundred or a couple hundred dollars.
Maybe or maybe not in this case- just thinking out loud.
You can go online and find this coin that was not made as genuine or made in the original mint, and it is claimed to be silver.

Without a picture my answer cannot be much more that a guess:
Pressure die cast fake, base metal core, silver plated.

A probable alloy suitable die casting could/would be copper tin lead and perhaps some antinomy for hardening. Such an alloy has a with paste range suitable for die casting, and the density and color of the alloy can also be controlled.
A planchet set up in this way could also be suitable striking a few hundred coins with relatively soft dies, before being worn out.

Over time, some silver and copper atoms exchange places at the plating interface, which could explain the presence of copper in the XRF test. Copper can also be explained by adding a small amount of copper to a silver plating alloy.

Subject coin may still have a nice ping tone, but pitch can be tested against a known genuine coin.

A good book on this subject:
'Numismatic Forgery' by Charles M Larson.
Endorsed by Ken Bressett, past president of ANA for essential reading.

Hi Sel sorry still new to this hopefully you see this reply-the xrf machine I had it tested on is not the run of the mill home type but a professional grade machine that does a deeper penetration with detailed compositions. I've done other coins on it in the past and know it to be accurate. So I do know that the coin is .950 vs the .900 in Krause. I was hoping either other collectors had done the same test on theirs and could share the results or if someone was aware of a 5% spread on silver content could be ‚correct for the period'? Many thanks

Typical tolerance for the fineness (silver content) of contemporary other European silver coins was around 0.3 %, so a difference of 5 % is out of the question.

Would like more photos like photos of the reverse and the edge.

At the moment, there doesn't seem to be much information.