At 16 cm height and 15 cm length it is definitely a large crawling Krishna vigraha. Very heavy as well.

A typical representation of butterball Krishna, crawling on his fours and holding a butter ball in his right hand. This is the scene of his running away from his foster mother, Devaki, after stealing the butter ball.

This Vigraha is from the Bengal region, identified by the top knot and painted decorations. Here the painted decorations highlight the ornaments rather than represent the ornaments.

This Vigraha is meant for home worship. In Bengal he is NaduGopal (Nadu- ball of butter and Gopal – the keeper of cows).

See the painting below, now in the British Museum, for comparison. https://www.britishmuseum.org/collection/object/A_1990-1031-0-3

This Vigraha may be dated to the nineteenth century, coeval with painting referred above.

This iconography is also common in South India and Maharashtra. For another example crawling Krishna from Tamil Nadu

Though, as per literature, the worship of Child Krishna in Bengal dates back to the medieval period, I have not come across any standalone metal or stone Vigrahas of Krishna of that period. This is in contrast to Tamil Nadu. Some of the dancing Krishna’s are dated to the 11th century and the crawling Krishna’s, like the one in this blog, are dated to the fifteenth/sixteenth century.