All About Pocket Knives

i recently bought a box lot at an area auction and found these in bottom of box they appear to be 19th century to me and ivory handles,but cant find much info on maker marvill regan & company columbiaworks sheffield seems to be of nice quality any collectors of this on here and any info will be appreciated

my book only states the name and nothing else but, here is something i located of interest.
http://cgi.ebay.com/11-pc-civil-war-era ... ltDomain_0
maybe the knife sold for that much

can anyone tell by pic if it is ivory if so there are 4 big slabs

Nothing in Geoffery Tweedale's new book either I'm afraid. Nice old set.

An easy way to tell the difference between bone and ivory is to look to see if it is porous. Bone is porous due to arteries and capillaries that fed blood to the bone when the animal was alive. Ivory isn't porous. Instead it has a grain to it like wood. Judging by what I can see in the pictures it looks like the handles are bone because they look porous to me, but check it yourself. It should be easier for you to determine since you have it in your hand. Hope this helps.

no pores looks like wood grain im sure its ivory

Knice dude...... they look cool!