How much is a 1970 100000 Turkish lira worth now in USD?

About 20 cents.

There are 1,000,000 old lira in 1 New Turkish lira, so your old lira have little money value, just curiOSity value.

Any remaining old lira has to be converted at either the Turkish Central Bank or T.C. Ziraat Bank branches, at the rate of 1 million old lira = 1 new lira.