My signture

I need to know how I use to sign my name in the 1970's to prove something is mine, this is for the NS&i bonds.

my name then was Jones and I married again in 1990 and cannot find anything with my signture on from before this.

I try to write it but I am not sure it is the same, can you suggest where I could get a copy of my signture I have looked at old paper work but with out success.

Thank you in anticipation

JIP