It is made from vitreous enamel fused onto sheet steel.  Heavy gauge - unlike modern versions this one can't be bent easily.  Very durable.  Made in around 1900.  They really don't make them like these today.

This example is from northern industrial France - few other areas have any house numbers running this high. The damage through age is corrosion during decades of rainwater limescale, acid rain and industrial grime.

It has been partially restored by me - removal of limescale and grime and removing/curing the rust.  A time consuming process - similar numbers 576, 574, 572 and 570 will be listed when I've done them.  They are from the same block or row of properties.

4" high 8" wide.  The white enamel is in relief, giving it excellent definition.

This is the real thing from a real house in real France.  Not a copy, not made yesterday.  From a house in Lille area.

Around four thousand house numbers in stock at the last count - large, small, old, high, low, enamel, cast metal, bell metal, convex, flat, Danish, French, Australian, Japanese, German, Belgian, UK.  Please let me know if this is not the number or style you require. But I have few numbers higher than #600.

All numbers accurately described - I do not try and mislead customers by applying euphemisms such as "authentic" or "traditional" or "original" or "vintage" or "style" to pass off cheap repro items as the real thing.

USA/Canada, rest of world tracked signed for shipping free of charge.

Please see my other listings if you like French signs and numbers.