Im revisiting this again:
This is what I have so far:
Im 90% sure this footage of Ernie Vigh. The film is a standard 8mm home movie with an edge
code identifying the film as dating from July-Dec 1939 or anytime in 1947. I contacted the
Eastman-Kodak museum in Rochester and they stated that it was unlikely the film would have
been used anytime more than a year after the dates above. Possible but not likely.
Below are more photos of the film:
Pics showing the fighter I think to be Vigh

Pics showing the opponent

round card, I believe these would be helpful in identifying the venue

Vigh's cornerman. In the early 40s, in his heyday, Vigh was trained by Dan Florio and managed by Sol Gold. Prior to being managed by Gold he was managed by Harry Christie. I do not know if Gold managed him after he returned from the service in the mid/late 40s but if someone else managed and trained him it would point to this fight being from circa 1947

The fight went at least 8 rounds

Shortly before the stoppage vigh had hammered the opponent to the canvas

Vigh was hammering the fighter here and it looks like the ref stopped it. If not then the bell rang at this point.

Vigh after the conclusion of the fight

Vigh shaking hands with his opponent after the fight, note the microphone which does not
look like the microphone for MSG at this time.

Vigh leaving the ring
Below is a list of the fights it could possibly be:
1949-12-08 Tony Bertucci Broadway Arena, Brooklyn, US L SD 8
1949-10-27 Vic Costa Sunnyside Garden, Sunnyside, Queens, US W PTS 8
1949-09-26 Jimmy Mills Laurel Garden, Newark, US W PTS 8
1947-06-25 Joe Bennett Jamaica Stadium or Jerome W PTS 8
1942-01-09 Coley Welch Madison Square Garden, New York, US W PTS 8
1941-12-23 Augie Arellano New York Coliseum, Bronx, US W PTS 8
1941-11-28 Lou Schwartz Madison Square Garden, New York, US W PTS 8
1941-09-10 Johnny Colan Chicago Stadium Outdoor Arena, Chicago, US L TKO 8
1941-07-23 Tony Martin Chicago Stadium Outdoor Arena, Chicago, US L PTS 10
1941-06-05 Coley Welch Exposition Building, Portland, US L PTS 10
1941-04-30 Steve Mamakos Uline Arena, Washington, US L UD 10
1941-03-07 Billy Soose Madison Square Garden, New York, US L PTS 12
1941-02-07 Billy Soose Madison Square Garden, New York, US L UD 10
1941-01-03 Coley Welch Madison Square Garden, New York, US W PTS 8
1940-12-17 Gene Molnar New York Coliseum, Bronx, US W TKO 8
1940-11-26 Jay Macedon New York Coliseum, Bronx, US W PTS 8
1940-04-30 Babe Orgovan New York Coliseum, Bronx, US W TKO 8
1940-03-26 Georgie Abrams New York Coliseum, Bronx, US L PTS 8
1940-01-09 Bep van Klaveren New York Coliseum, Bronx, US L PTS 8
Of those above I believe we can safely disregard Vigh's losses as he appears to be in complete control here and scores at least two knockdowns, one in the first and one in the 8th, maybe more. I also believe we can eliminate Lou Schwartz and Augie Arellano (they look nothing like this guy).
My #1 suspect is Joe Bennett but I cant even confirm if this fight legitimately took place and cant find a photo of Bennett. Most of the others dont really look like this guy which brings up the possibility that there is a missing Vigh fight out there.
Here are some pics of Vigh:
