1. ALL DIMENSIONS ARE IN MILLIMETERS. 5(	3tPbm{  
2. MATERIAL: OPTICAL GLASS PER MIL-G-174 vV%w#ULxE~  
   TYPE:  HZK21 CDGM                  NO.623581 -0Ps.B   
NP 1.6230    ±    V     ±   58.2 2gA6$s7  
   STRIAE GRADE      ,           ANNEAL T5ol2  
   MELT NO. FbF P  
3. 'P' PITCH POLISH TO TEST PLATE WITHIN KcHW>IBxdv  
   POWER AND IRREGULARITY INDICATED. ct`89~"  
4. MANUFACTURE PER MIL-O-13830 e7-U0rrE  
5. SURFACE QUALITY d;K,2  
6. 'C' MAGNESIUM FLUORIDE COATING PER MI    cY5h6+ _  
   FOR MAX TRANSMISSION AT         MILLI     BV|LRB}G  
7. 'G' FINE GROUND & BLACKENED PER GujmBb  
8. BEVEL EDGES AT 45 DEG TO       MAX FA      m}rUc29cS,  
9. DIAMETER TO FLAT IS          (REF) |(]XZ !{  
   WITH SURFACE SAG OF          ON SURFA