Luc, Interesting horse muzzles also called Kuchikago..
Difficult with the photos Is it monkeys in the left? If yes the monkey are often present,depicted because they are supposed to protect horse against desease..
In the 2nd kuchikago the upper zigzag part is a protection, shinto dedication..
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I saw only few from Kaga, or with crests or signed Myochin..edo..
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(Also 2 show p10 in "the arms and armour" book from I. Bottomley and A P Hopson.. )
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Do you have more details, mei ?
Interesting post 🆙
Laurent