Hi Kane,

Thank you for contacting Mearto with your appraisal inquiry.

Nearly all contemporary cabinetmakers stamp, brand or otherwise label their pieces but earlier in the 20th Century, when this was made, there wasn't as much uniformity with doing that as there is now. There hasn't been enough research done in identifying cabinetmakers marks to be able to say who made this. The number "455" could refer to the model/pattern.
The use of bubble glass was popular in the 50s. Some makers that incorporated bubble glass into their breakfronts include Ebert, Hendredon, Ethan Allen and Baker, all reputable names.

The marketplace for this kind of furniture is quite low and when unattributed cabinets of this size and form come to auction these days, they usually sell for between $400 and $700; attributed ones only sell for a little more - usually $500-1,000.

Based on the photos and information provided, and subject to examination, this is:

A vintage George III style mahogany breakfront library cabinet
unattributed maker, possibly American, circa 1950s
With outset breakfront cornice of a corresponding case with Greek key top over four glazed cabinet doors opening to a shelved interior, the lower section centering an outset long drawer over two cabinet doors with paneled oval facades flanked on either side by a stack of four short drawers, on box bases.
7 feet tall, 6 feet wide
CONDITION: This appears to be in good condition; value assumes no breaks, repairs, losses or replacements.
PROVENANCE: Acquired at auction
$ 400-700*
*represents a fair-market value for auction purposes; retail or asking price may vary.

Please let us know if you have additional items to appraise, or questions/concerns, and thank you again for using Mearto.
~ Delia