The online community of knife collectors, A Knife Family Forged in Steel
I'll take a closer look later on, but if you want, check HERE to see if you can nail it down yourself. :-)
I love Boker for the fact they make it easier to date their knives. LOL. Check the PDF from KnifeWorld. Very bottom of the document in the left corner. Looks like yours is US made, circa 1899-1920. I believe this was the first run of exclusively US made Bokers. Hope that helps a bit!