If I were to right align the signature I would also right align the Compliment, and assuming there's no actual signature, I probably wouldn't have any space between the Compliment and senders name.
A Victorian Miss suited to be a governess would not send an undated letter - also right aligned
And if she used someone's name in the Salutation she would use 'Sincerely' in the Compliment, probably without the 'Yours' - unless she was being deliberately flirtatious
BR