[sdiy] Help ID a diode

[MTG]

I have 2 diodes in a logic circuit that I am trying to ID. Their purpose 
(my best guess) I will explain below. They are in series so I assume 
they are the same.  They are both the orange glass type and look like a 
1N4148 or a 1N914, but the numbering is off.

The first one has a stylized "F" and the numbers "25".

The second has what looks like "T1" or maybe "TI" and then "525" as far 
as I can tell.

The circuit is a 4011 logic circuit, part of the battery backup logic.  
The 4011 is powered by a diode combination of 5v or the 3v coin cell, 
whichever is larger.  Other diodes, not these ones.

My attempt at deciphering...These diodes and 1/4 of the gate package are 
intended to disable a CE* signal when 5v goes away. I will attempt ascii 
draw:


                                  |-----\
"5v"----|>|---|>|----+-----------|      \
                      |           | NAND  >0----RAM_CE*
                      <    CE ----|      /
                  10k <           |--- -/
                      <
                      |
                     Gnd

This is some home-brewed memory expansion (not mine) and it has issues 
where some of the bytes change after a while (possibly during 
power-cycling).  I don't know that this is the culprit but it's pretty 
odd by what I have seen around synths. I swapped out the RAM and it 
still occurs.

Do you suppose these are schottky??  The number 25 or 525 means nothing 
to me in diode land.

I may have to come up with some other solution, but I wanted to try 
swapping these out first.