Self-made image converted from the following vector PostScript source code:

%!
314 395 translate .32 dup scale 0 setgray 64 setlinewidth 357.5 200 50
90 30 arcn 703.911 -200 50 210 270 arc 850 -250 lineto 850 250 lineto
550 0 250 90 270 arc 550 -50 200 270 90 arc 550 0 150 90 270 arc 550 -50
100 270 90 arc 550 0 50 90 150 arc 319.06 -200 50 330 270 arcn 153.911
-200 50 270 210 arcn -192.5 200 50 30 90 arc -550 0 250 90 270 arc -550
-50 200 270 90 arc -550 0 150 90 270 arc -550 -50 100 270 90 arc -550 0
50 90 150 arc -780.94 -200 50 330 270 arcn -900 -250 lineto -900 250
lineto -742.5 200 50 90 30 arcn -396.089 -200 50 210 270 arc -230.94
-200 50 270 330 arc 0 0 50 150 90 arcn 0 -50 100 90 270 arcn 0 0 150 270
90 arcn 0 -50 200 90 270 arcn 0 0 250 270 90 arcn closepath gsave stroke
grestore .175 .825 .175 setrgbcolor 30 setlinewidth stroke/A{0 setgray
64 setlinewidth 0 0 50 94 150 arc -36 60 cos mul -36 60 sin mul rlineto
stroke 0 0 150 200 233 arc stroke 0 0 250 117 130 arc stroke 0 -50 200
294 313 arc stroke 1875 sqrt neg 25 moveto -205 60 cos mul -205 60 sin
mul rmoveto -74 60 cos mul -74 60 sin mul rlineto stroke -149.198 225
moveto 98 60 cos mul -98 60 sin mul rmoveto 62 60 cos mul -62 60 sin mul
rlineto stroke -149.198 225 moveto 379 60 cos mul -379 60 sin mul
rmoveto 62 60 cos mul -62 60 sin mul rlineto stroke .175 .825 .175
setrgbcolor 30 setlinewidth 0 0 50 91 150 arc -39 60 cos mul -39 60 sin
mul rlineto stroke 0 0 150 197 236 arc stroke 0 0 250 114 133 arc stroke
0 -50 200 291 316 arc stroke 1875 sqrt neg 25 moveto -202 60 cos mul
-202 60 sin mul rmoveto -80 60 cos mul -80 60 sin mul rlineto stroke
-149.198 225 moveto 95 60 cos mul -95 60 sin mul rmoveto 68 60 cos mul
-68 60 sin mul rlineto stroke -149.198 225 moveto 376 60 cos mul -376 60
sin mul rmoveto 68 60 cos mul -68 60 sin mul rlineto stroke}def -550 0
translate 3{A 550 0 translate}repeat showpage
%EOF