A list might workwith really cheap simple stuff - but I reckon as the price goes up a bit - so does the risk.... it is so easy to get stung.
I was on the isle of Geurnsey a couple of years ago and spotted what looked like a Sanderson wood and brass camera on a tripod with a very nice brass lens. The shop was closed and the camera too far away from the window to see well - but I thought it said 'Geortz' on the lens.
From a distance, it looked fantastic! I rushed back the next day to have a good look...
The camera was actually made up from parts of at least two damaged cameras made from different wood. Although it looked almost like a complete camera, it was not able to focus or fold. The bellows were terrible - almost disintergrated. There was no name on the camera (any bits of it) and it wasn't really repairable or restorable, as such, as it wasn't nearly complete. The tripod looked like it had been adapted from an artists easle and was probably not very old...
Moving on to the lens. It did indeed say Geortz Dagor on the front! Yeah!
Only.... someone has obviously cleaned the glass with an abrasive pad - unbelievably scratched - and the rear elements were missing. The iris had collapsed and the blades were rattling around inside - but because the rear was missing a few of them had got lost - the barrel was obviously very corroded and scratched but had been 'polished up' to look good with brasso....
I reckon the owner must have looked up 'Dagor' on google or something... and come over all 'optomistic'. The price tag was £1000!!!!
At first glance by someone who didn't know anything about cameras - it might have seemed quite attractive. After a closer look - even at $20 I wouldn't have bought it...
The moral is - you've
got to see it, I reckon!
Maybe the best tactic is to equip said Mother-in-Law with a mobile phone with a built in camera and get her to give you an on the spot description with an emailed photo?