Lock knife ID please

Hi guys, I just picked up this lock-knife from a car-boot sale. It has "INOX Solingen Germany" on the blade; terms I am familiar with, and RS on the rubber handle. All I'm wondering is what does the RS stand for. Any ideas? Thanks in advance for any info.

Looks like a Richartz

Could be these guys: http://rs-messer.at/

Oops! I think Mike is correct.

Looks about right. Thanks chaps.