Hello,
That is stunning! I am envious as I do not think I have a Lely hat. I do not have any research on the designer, but, like you, have seen references on line or in magazines. A few of my older Vogue magazines show Lely hats and mention the styles and materials, but nothing else. What I found elsewhere was all written in French, which I do not read very well, (but I am going to learn someday).
I agree on the 1930 dating...possibly 1928-1929...it could be 1930 since the millinery styles were in flux and changed radically in a short time from 1929-1930. Is it wool or is it fur-felt? I am guessing it is a fur felt.
I am one of those people who does not ever use recent sale prices to evaluate a hat's pricing or worth. Hats, like other garments, can be all over the map and a final sale price can have nothing at all to do with its true "value/worth". I recently saw a 1930's Schiaparelli hat sell for for $30, but we all know it is worth 100 times that amount. Conversely, I saw a butt ugly, hot glue and turkey feather, cheap wool body Jack McConnell hat from the mid 1990s sell for $1000 and it was worth 1/20th of that. Realized prices, (whether live auctions or in line shops) are extremely misleading to evaluate a hat's worth....I just cannot recommend that as a pricing method. I hate to say this, but easily 80% of the hats I see on-line are way out of line with pricing, most are overpriced and dated incorrectly. And at auctions they sometimes go for tiny prices too. It really is way too all over the map to be an accurate method.
Back to the hat.....it is stunning. As a collector, I can say that it is a true rarity, especially beautiful, and so I would price it accordingly...on the high side.
B