I posted the highest Mauser - Röll Serial number known to me here:
http://forums.nitroexpress.com/showflat.php?Cat=0&Number=231433&an=0&page=2#Post231433
It's # 128171, proofed 1960. Typical for most Walter Röll rifles ist the Mauser design, but light alloy, bottom metal with a steel floor plate. See Jon Speed’s “Mauser Archive”, page 503.