The
Mugwumps Index of American Fretted Musical Instrument Makers lists Angelo Mannello as building in NYCity 1886-1906. The index gives no other information, but that narrows the period down somewhat. Another website lists Mannello's lifespan as 1858-1922. A
PDF reprint of a 1903 Music Trade Review gives an ad for Mannello's shop at 676-680 Eagle Avenue in New York.
There's a Mannello mandolin displayed
here with the identical pickguard and binding, but without the mother-of-pearl fretboard. Slightly different headstock. I'd agree with your assessment that yours is probably one of his higher-end instruments. How many ribs or staves in the bowl-back? And is it rosewood? Rosewood and more ribs are generally also indicators of an upscale instrument.
The Mannello at the Metropolitan Museum of Art is an extreme example of a "presentation grade" instrument, almost totally encrusted with mother-of-pearl, and probably designed for display rather than actual use. According to the caption, it was donated to MMA by the Mannello family in 1972.
Google searching yields quite a few hits on Mannello mandolins, when you consider they were apparently made 110-130 years ago, so we can deduce that he was quite a prolific luthier; the fact that his shop took up three addresses on Eagle Avenue also suggests it may have been fairly large-scale. I wouldn't necessarily use the term "mass production," as the shop might have had a half-dozen or dozen craftspersons building instruments by hand, but apparently a well-known member of the contingent of Italian builders in New York, who turned out many bowl-backs around the turn of the 20th century.
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