Just a guess, but it is probably cheaper because it is left handed and hasn't sold as quickly as the owner would like.

Info on Harris Gun Works should be here somewhere.

http://www.google.com.au/#hl=en&cp=1...l=&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=2da07c6728c7d804&biw=1536&bih=686.