Perforated All Around Cover

Are these type of covers common with perforations all around? I assume the idea is that a letter was enclosed inside and the cover (as I have it) merely contains the stamp/cancellation and address on the one panel with the other three panels blank.



It has embossed in the upper RH corner a patent date of March 17, 1908, so I looked it up in the U.S. Patent Office and came up with Patent #882.297 issued to Charles W Cook of Holyoke, Mass.:



Just thought this to be an interesting look to an early 20th century cover.

Very common, we still use them in Australia today.
They are referred to here in Oz as "Lettercards"

What they look like before the gummed edges have been ripped off
to open

Thanks.

Back to my cover, I think I found the content page that was enclosed:

That's very unusual,
looks like a privately produced lettercard.

May we have a close up of the script please?
I'd like to see if we can locate his paintings on the internet.
I cannot read his name, or the other style of painting theme.

As requested, a close up of the invitation:

I never thought to look up the artist, but I just did an internet search and came up with this:


C. Calusd (1860-1936)
An American painter specializing in Marine night paintings, he lived in Constantinople and had a studio at 225 5th Ave., New York City.

Studied:
Ecole des Beaux Arts Imperial in Constantinople; and pupil of the Shah's Court Painter, Valeri.

Prizes:
First prize and diploma of honor at the International Exhibit of Art in Bulgaria; Patronage of the Czar of Bulgaria; Queen Carmen Sylvia bought several of his paintings in Bucharest; President Woodrow Wilson hung his painting - "Statue of Liberty" of New York Harbor at Night - in the Whitehouse, Washington, D.C. in 1918.

Exhibited:
Extensively in Turkey, Bulgaria, Persia, etc.; at the Plaza Hotel, NYC, under the patronage of H.H. Topakyan, H.I.M. (His Imperial Majesty), the Shah's own Consul General , Jan. 6 - 19, 1913, "C. Calusd, Marine Painter"; Exhibition of Marine Painting by C. Calusd, 546 Fifth Ave (45th St.), Feb 12 - March 3, 1915, under the patronage of Col. the Hon. Mesrup Nevton, Khan.

The American painter from Constantinople has won fame with his paintings of the Sea of Marmora and of the Bosporus, and now with his Statue of Liberty hanging in the Whitehouse. At his latest exhibition are recent seascapes from New England at Newport, New Bedford, Bar Harbor, Gloucester, etc. The sea is his delight, the quietude when only the moon looks on, the sea in repose, with raiment's of blue and jet and gold. He also paints fisherman, the sea of violence and billowing waves; a poet of the sea. "Heaven's Light" glows with exquisite blue sky and moonlit water He recently has taken interest in great American birds.

C. Calusd Exhibition at his Studio at 225 Fifth Ave. The painting "Our Pride" shows warships in the foggy night standing sentinel over the sleeping city, and "Castles of Wealth" displays the twinkling towers of Manhattan seen from the bay.

Thanks,
your card pre 1936 1915

Assuming the invitation ties in with the cover shown in my original post, the date on the cover is January 22, 1920, which would be in line with a gallery exhibition that was slated for "January 23 to February 5".