What
DISCOGS tells us...
Evidently, pristine copies have sold for $25 or more, but that overlooks the many who would never be prepared to release their copy...
So, like all things DISCOGS - may be worth much more.
Nice find.
Era IV An Audio Obstacle Course

Shure – TTR 115, Shure – TTR115
Audio Obstacle Course
Vinyl, LP, Gatefold
US
1977
Non-Music, Classical
Technical, Opera
Track List:
A1 Introduction
A2 Level, Balance And Phasing Tests
A3 Orchestral Bell Test
A4 Flute Test
A5 Harp Test
B1 Harp And Flute Test
B2 Flute And Orchestral Bell Test
B3 Greensleeves (Entire Selection)
B4 Introduction To Tone Arm Resonance Test
B5 Tone Arm Resonance Test
Phonographic Copyright ℗ – Shure Brothers Inc.
Copyright © – Shure Brothers Inc.
Made By – Shure Brothers Inc.
Pressed By – Wakefield Manufacturing – 31966
Producer – The Development Engineering Department Of Shure Brothers Inc.
Trackability Test Record for Stereo Cartridges
(p)1977, Shure Brothers Inc. - All rights reserved
Made in U.S. A. Shure Brothers Inc., 222 Hartrey Ave., Evaston, IL 60204
Sides identified on labels: SIDE ONE / SIDE TWO
Gatefold jacket with technical notes
The catalog# is printed as "TTR 115" on the front cover but as "TTR115" on the labels.
Matrix / Runout (Runout side A variant 1): 80A353 T1 31966 #4
Matrix / Runout (Runout side B variant 1): 80A353 T2-3 31966
Matrix / Runout (Runout side A variant 2 etched [the tulip logo is stamped]): 80A353 T1 #3 [tulip logo] 31966 MO#2
Matrix / Runout (Runout side B variant 2 etched [the tulip logo is stamped]): 80A353 T2 5 I[tulip logo] 31966