  We present analyses of improved photometric and spectroscopic observations
for two detached eclipsing binaries at the turnoff of the open cluster NGC 752:
the 1.01 day binary DS And and the 15.53 d BD $+$37 410. For DS And, we find
$M_1 = 1.692\pm0.004\pm0.010 M_\odot$, $R_1 = 2.185\pm0.004\pm0.008 R_\odot$,
$M_2 = 1.184\pm0.001\pm0.003 M_\odot$, and $R_2 = 1.200\pm0.003\pm0.005
R_\odot$. We either confirm or newly identify unusual characteristics of both
stars in the binary: the primary star is found to be slightly hotter than the
main sequence turn off and there is a more substantial discrepancy in its
luminosity compared to models (model luminosities are too large by about 40%),
while the secondary star is oversized and cooler compared to other main
sequence stars in the same cluster. The evidence points to non-standard
evolution for both stars, but most plausible paths cannot explain the low
luminosity of the primary star.
  BD $+$37 410 only has one eclipse per cycle, but extensive spectroscopic
observations and the TESS light curve constrain the stellar masses well: $M_1 =
1.717\pm0.011 M_\odot$ and $M_2 = 1.175\pm0.005 M_\odot$. The radius of the
main sequence primary star near $2.9R_\odot$ definitively requires large
convective core overshooting ($> 0.2$ pressure scale heights) in models for its
mass, and multiple lines of evidence point toward an age of
$1.61\pm0.03\pm0.05$ Gyr (statistical and systematic uncertainties). Because
NGC 752 is currently undergoing the transition from non-degenerate to
degenerate He ignition of its red clump stars, BD $+$37 410 A directly
constrains the star mass where this transition occurs.
