rebuild stamp identification ?

[RCS]

I found this among some old papers from around 2005, can anyone identify this rebuild stamp and the time period ?

thanks RCSAttachment 105298

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[RCS]

I did find some additional information: This stamp has been found on late WW1 or early post WW1 stocks including a Mark 1 stock

[fernleaf]

Appears to be an unknown inspectors mark from the 1918-1920 period.

[P51Mustang]

I agree from what knowledge I have.....