Preliminary identification
Photo reference
4 uploaded photos
Overview
A massive, professional-grade municipal atlas featuring detailed surveys and official plans of Philadelphia at the dawn of the 20th century. These 'insurance maps' or real estate atlases were the Google Earth of their day, meticulously documenting every building, property line, and street.
Story
In 1901, Philadelphia was the 'Workshop of the World.' This atlas was a vital tool for civil engineers and city planners to track the explosive growth of the industrial age. It captures a city in transition before the automobile changed everything.
Maker / Origin
George W. and Walter S. Bromley were premier civil engineers whose firm became legendary for producing the most accurate property atlases in America. Their work was so precise it was used by insurance companies to determine fire risk and by city officials for legal property disputes.
Condition & Value
The title page shows significant edge wear, foxing, and moisture staining. The binding appears fragile with some loose pages; however, the core historical data remains legible. Condition issues typically reduce value by 50% compared to a pristine copy.
Full Research
Sold comps, value drivers, and venue guidance pulled from recent auction results.
Build on this identification
Layer in sold comps, value drivers, and venue guidance.
Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.
Best Venue
Specialty auction or a focused dealer with buyers already in this lane.
Signed example with light edge wear and original frame.
Comparable format with stronger provenance and cleaner surface.
Smaller related piece with visible craquelure and trimmed margins.
Period match with softer condition and weaker subject matter.
Close market lane comp with similar material and presentation.