Ok Raimey:
I removed the forend and after cleaning away God knows how long an accumulation of grime I found the following:

1081.02.9.6

Note: The dot between the 9 and the 6 is actually at the top but I've no way of typing this.

Another point:
The contour of the barrels on the underside actually follows the outline of the forend.
I can post another picture if necessary.
Regards
Jim

The 2nd Amendment IS an unalienable right.