Self-made graphic, generated from a version of the following vector PostScript source code:

%!
/!{def}def/s{setrgbcolor}!/l{stroke}!
gsave 300 -60.775 translate 1.11 dup scale/x{63.567}!
55.051 400 44.949 add x 120 -45 arcn 0 300 lineto
-55.051 400 44.949 add x 225 60 arcn
gsave 6.26 6 mul 1.11 div setlinewidth l grestore
17.1 1.11 div setlinewidth .92 .96 1 s l grestore gsave
0 240 translate 6 dup scale
/S{3 sqrt mul}!/k{0 0 0 s 6.26 setlinewidth}!
/K{1 setgray 2.85 setlinewidth}!
/C2{25 3 sqrt div}!/C3{25 8.5 cos div}!
/C4{C3 8.5 sin mul}!/C5{50 C2 C4 sub C3}!
/C6{62.5 C4 S 2 div add C2 12.5 S add C4 2 div add C3}!
/C7{37.5 C4 S 2 div sub C2 12.5 S add C4 2 div add C3}!
k C5 3.65 60 arc -14 14 3 sqrt div rlineto l
C5 176.35 120 arcn 14 14 3 sqrt div rlineto l
C7 -116.35 56.35 arc l C6 123.65 -63.65 arc l
K C5 6.12 60 arc -14 14 3 sqrt div rlineto l
C5 173.88 120 arcn 14 14 3 sqrt div rlineto l
C7 -113.88 53.88 arc l C6 126.12 -66.12 arc l
k C7 -16 3 arc l C6 226 237 arc l C6 159 174 arc l
C5 29 47 arc l C7 -87 -63 arc l K C7 -17 4 arc l
C6 225 238 arc l C6 158 175 arc l C5 28 48 arc l
C7 -88 -62 arc l grestore 37.56 setlinewidth
300 479.314 moveto -33 -33 3 sqrt div rmoveto
-44 -44 3 sqrt div rlineto l 17.1 setlinewidth
1 setgray 300 479.314 moveto -32 -32 3 sqrt div
rmoveto -46 -46 3 sqrt div rlineto l 0 setgray
10.23 setlinewidth 300 479.314 moveto 
-26 26 3 sqrt div rmoveto 6.8325 dup S rmoveto
52 -52 3 sqrt div rlineto l 300 479.314 moveto 
-26 26 3 sqrt div rmoveto -6.8325 dup S rmoveto
52 -52 3 sqrt div rlineto l
300 -60.775 translate 1.11 dup scale
6.26 6 mul 1.11 div setlinewidth
55.051 400 44.949 add x 112 79 arcn l
30 330 moveto 35 35 rlineto l
-55.051 400 44.949 add x 189 225 arc 4 -4 rlineto l
17.1 1.11 div setlinewidth .92 .96 1 s
55.051 400 44.949 add x 113 78 arcn l
29 329 moveto 37 37 rlineto l
-55.051 400 44.949 add x 188 225 arc 5 -5 rlineto l
showpage
%EOF