Blackjack Knife steel?

[rasp181]

I recently acquired some unfinished knife blanks from the old Effingham, Il. Blackjack Knife co. and am wondering what steel they used. I know it was a high carbon steel and from the appearance and grinding characteristics I believe it to be in the 10 series of carbon steel.
If anyone knows for purpose of heat treat it would be greatly appreciated.

[McAhron]

I believe their adds said 1095

[AUBE]

i remembered it being 1095 too but found this in a search

"I have decided that it is time to set the record straight concerning the blade steel used on most of the Effingham era carbon steel bladed knives. Officially the company always said it was 0-170-6. According to Mike Stewart former BlackJack CEO, in most cases it's actually 1095 or 52-100. This was done because Sharon Steel which was the company that made 0-170-6 went out of business in 1988. By about 1991 supplies were drying up. Since 0-170-6 is really an improved version of 1095, many companies who were using the former switched to the latter. Including BlackJack. This was until 1992 or so when according to Mike Stewart the company switched to 52-100. Mike told me they bought their first heat lot of 52-100 in 1992 and also stated at the time it took about a year to actually get a heat lot after the order was placed."

http://www.blackjack.0catch.com/pages/effingham_fyi.htm