I agree with Farb. I think the earliest G.24(t)'s were virtually the same as Vz.24's and had bolts in the white.It likely changed in the no letter block.
I have photos of a high 9000 no letter block range rifle and it's bolt is in the white, but the gun is heavily cleaned. Still, I think the bolt wasn't ever blued.
Are you sure Bob? I'm thinking initially the G24t looked just like a VZ24 including sling arrangement and in the white bolts. Not sure an "a" block would be in the white though.
I had an early no-letter and the bolt appeared white, but the nocks had crannies seem blued IIRC. Stock was cleaned, receiver was perfect, figured the bolt had been clean up too as I remembered it...