Old Master Oil on Board Russian Imperial Portrait

Old master oil on board Russian Czar Imperial portrait painting with verbiage within painting and en verso "Gregoire Otrepieff-Nelidow Premier Faux-Dmitriy, Original au Musee Historique a Moscou", seated in giltwood frame, 19th century.
Measures - 16.75" H x 16.75" W x 1.75" D overall; 12.5" H x 12.5" W sight.
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Condition Report: Overall good condition with some varnish crackling and frame loss.
Wear consistent with age and use.