But baseball reference shows this as an 8 inning game vs. The Houston Colt 45s on September 9th.
New York Mets vs Houston Colt .45s Box Score: September 9, 1962
1962 New York Mets LogoNew York Mets
7
35-109
1962 Houston Colt .45s LogoHouston Colt .45s
7
56-87
Sunday, September 9, 1962
Start Time: 4:00 p.m. Local
Attendance: 3,630
Venue: Colt Stadium
Game Duration: 3:07
Day Game, on grass
Logos via Sports Logos.net / About logos
1 2 3 4 5 6 7 8 R H E
1962 New York Mets Logo New York Mets 0 2 0 0 3 1 1 0 7 10 1
1962 Houston Colt .45s Logo Houston Colt .45s 3 1 0 1 2 0 0 0. 7 10 1
Other Info
Umpires: HP - Ed Vargo, 1B - Shag Crawford, 2B - Doug Harvey, 3B - Al Barlick.
Time of Game: 3:07.
Attendance: 3,630.
Field Condition: Dry.
Start Time Weather: 90° F, Wind 18mph in from Centerfield, Cloudy, No Precipitation.
Edit:
https://www.ultimatemets.com/gamedetail.php?gameno=145&tabno=B
"... the game is halted at the end of eight innings because of curfew (no inning shall start after 7 p.m. on Sunday night). When the game was called each team had seven runs, ten hits and one error. This was the final game scheduled between the two teams in Houston which means next week they will attempt to play six games in three days due to earlier postponements."
Then, apparently, one of the three doubleheaders was canceled and never made up. Hence 161 games including one tie.