[Lucas00]

I'm not an expert but I compared with about 30 quick image results on Google and to me it is not good.

I haven't seen an example with such a poor a. And I haven't seen an example with so much spacing in between the B and R.

The U in Ruth is connected a large amount of the time and when it's not it has a nice tail on the front side and is extremely close to touching. I don't see either of those traits.

For Sincerely
He never writes a swooping L like that. It's always very tight. Same Goes with the S too.

Unless it's a death bed signature I don't see it being real.

Maybe I'm overanalyzing, I would send it to psa regardless.