Icon maker mark ФФ

[Kirils]

Hello. I have this Icon. Does anyone know this maker ФФ in Saint Petersburg in the 1840s? Thank you in advance for your help.

[Dad]

Postnikova-Loseva, and then Ivanov (repeats) indicate only one master in Petersburg at that time with the initials Ф.Ф.
Friedrich Faber, born in 1802. In 1845 he would have been 43. Normal age.
Only one objection. The surname is not suitable for making vestments of Orthodox icons. But, everything happens.
No other options yet

For example ФФ 1832 and 1843

[Kirils]

Postnikova-Loseva, and then Ivanov (repeats) indicate only one master in Petersburg at that time with the initials Ф.Ф.
Friedrich Faber, born in 1802. In 1845 he would have been 43. Normal age.
Only one objection. The surname is not suitable for making vestments of Orthodox icons. But, everything happens.
No other options yet

For example ФФ 1832 and 1843

Thank you for your help. Please let me know in the future if you will have any additional information about this maker.